A stray mixed-breed dog, hungry and searching for food, back in October tagged along with some hikers south of the border who were feeding him, and together they scaled Pico de Orizaba, the highest mountain in Mexico. But when it came time for the humans to make the treacherous decent back down, the dog straggled behind; while the humans went home, he endured subzero temperatures for almost a month—until a climber eventually snapped a photo of him, posted it on social media, and it went viral. An online buzz ensued surrounding this dog, named El Canelo, and eventually word reached Layo Aguilar, an experienced hiker and teacher from nearby Veracruz. Previously, on Oct. 18, one Pedro Ruiz Guerrero had visited the mountain with his SUV in bid to retrieve Canelo but had no luck—nor did anyone else who tried. Guerrero contacted Aguilar who offered to help, and he set out …